The distance between the two berths is 36 km. How much time will the boat spend on the way from one berth

| January 5, 2021 | education

The distance between the two berths is 36 km. How much time will the boat spend on the way from one berth to another and back if its own speed is 15 kilometers an hour, and the speed of the river is 3 kilometers an hour?

1. When moving along the river, the speed of the river will be added to the boat’s own speed, that is:
15 + 3 = 18 (km / h) – boat speed downstream;
2. Let us find the time it takes for the boat to reach the berth downstream:
36/18 = 2 (hours);
3. When moving against the current, the river slows down the boat, that is:
15 – 3 = 12 (km / h) – upstream speed;
4. Time of movement against the stream:
36/12 = 3 (hours);
5. Let’s calculate the total travel time:
3 + 2 = 5 (hours);
Answer: the boat will spend 5 hours moving from one berth to another and back.



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